JP2568284Y2 - Handheld electronic calculator - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a handheld computer such as a handy terminal (handheld computer terminal) or a pocket computer, and more specifically, a so-called RA used as its external storage medium.
The present invention relates to an improvement in a management method for an M card (an external random access memory that is housed in a card-like housing and is detachable from the main body).

2. Description of the Related Art In recent years, so-called handy terminals designed to download and upload data and programs to and from a hand-held electronic computer, particularly a host computer, have been rapidly spreading. This handy terminal is intended to be used by placing it on the palm of your hand.
If an external storage medium is provided for this, it is preferable to use a RAM card in that a drive device such as a flexible disk is not required.

In addition, when replacing a floppy disk as a document file of a word processor, a random number from a random number generating means is stored in a document file and a storage means, and a coincidence between the stored random numbers is determined. No. 62-295141 is known.

[Problem to be Solved by the Invention] However, since the former RAM card does not have a means for detecting insertion / removal of a medium unlike a flexible disk drive, the RAM card is converted during the execution of a program. In such a case, there is a possibility that erroneous data is read or written. In the latter case, a random number of floppies of the word processor may coincide with each other, and there is no guarantee that the floppies can be completely identified.

[Means for Solving the Problems] Therefore, in the present invention, a variable data generating means for generating date and time information from a calendar function as different data each time, and a detachable external random number housed in a card-like housing. An access memory, writing means for writing date and time information from a calendar function taken from the fluctuation data generating means each time a file in the memory is opened to the file and to the memory and the internal memory in association with the file; Prior to reading and writing a file in the external random access memory, the date and time information from the calendar function corresponding to the file written in the memory and the internal memory. If there is a difference in date / time information from the function, read / write of the file in the external random access memory is not executed A hand-held electronic computer is proposed.

[Operation] In other words, in the present invention, at the time of opening a file, for example, the date, month, day, hour, minute, and second are read from an integrated circuit having a calendar function and written into the RAM card and the internal memory. Then, each time the RAM card is read or written, the two data are collated. If there is a discrepancy, the RAM card is replaced and the RAM card is not read or written.

[Embodiments] Details of the present invention will be described below based on illustrated embodiments.
FIG. 1 shows a block configuration of a handy terminal embodying the present invention. In FIG. 1, reference numeral 1 denotes a central processing unit (hereinafter referred to as "CP").
U ". In the following description, even when a parenthesis is added after a name, the name in the parenthesis will be used hereinafter. ), The monitor program stored in the read-only memory 2 (ROM) and the application program downloaded to the internal memory 3 are executed. Reference numeral 4 denotes a keyboard for inputting numerical values, various instructions (functions), and the like. Reference numeral 5 denotes a liquid crystal display (LCD) for displaying data supplied from the CPU 1. Reference numeral 6 denotes a calendar for generating year, month, day, hour, minute, second data.

A RAM card 7 stores a master file, a transaction file, and the like. Reference numeral 8 denotes a printer which prints out data supplied from the CPU 1 on roll paper or the like. Reference numeral 9 denotes an input / output port for exchanging data between the CPU 1 and the RAM card 7, the printer 8, and a host computer (not shown). Reference numeral 10 denotes a buzzer, which generates a confirmation sound for a key input, a warning sound, and the like.

Then, in this embodiment, the application program downloaded to the internal memory 3 is executed, and in the process, for example, if there is a command to “open the file A of the RAM card 7”, the control is executed by the ROM 2.
Is passed to the file driver 12 inside.

The file driver 12 first sets a flag indicating that the file A has been opened in a predetermined area of the internal memory 3. This prevents a double open operation on the same file. Next, the file driver 12 reads a directory related to the file A from the directory 13 of the RAM card 7 and stores it in a predetermined position of the driver directory area 14 of the internal memory 3. Further file driver 12
Reads the date, month, day, hour, minute, and second at that time from the calendar 6 and stores the date, month, day, hour, minute, and second for the file A in the RAM card 7
5 and stored in the file A year / month / day / hour / minute / second storage area 16 of the internal memory 3 and control is returned to the application program 11 of the internal memory 3.

As a result, the application program 11 is further executed. For example, if there is a command such as “Read record B of file A”, control is again passed to the file driver 12 of the ROM 2.

Upon receiving the control, the file driver 12 first reads the date, month, day, hour, minute, and second stored in the file A date, month, day, hour, minute, and second storage area 15 of the RAM card 7, and reads the date, month, day, hour, minute, and minute of the file A in the internal memory 3. It is compared with the year, month, day, hour, minute, and second in the second storage area 16.

At this time, if they match, the RAM card 7 has not been replaced with the one when the file was opened, so the file driver 12 refers to the driver directory area 14 and reads the file from the RAM card 7 The record B of A is read, and the control is passed to the application program 11 together with the contents.

On the other hand, if the year, month, day, hour, minute, and second do not match in this comparison, since the RAM card 7 has been replaced during the execution of the application program, the file driver 12 does not perform reading and controls the error processing routine 17 Pass to. Then, the routine 17 displays a message such as "RAM card is different" on the LCD 5 and drives the buzzer 10 to generate a warning sound.

Then, based on this warning, the user can use the original correct RAM
When the card 7 is connected and one of the keys is pressed, the error processing routine 17 reads out the contents of the file A year / month / day / hour / minute / second storage area 15 of the RAM card 7 and reads it from the file A of the internal memory 3. The contents of the storage area 16 for the date, month, day, hour, minute, and second are compared, and if they match, the error is recovered and control is passed to the application program 11.

When data is written to the file A of the RAM card 7, the date, month, day, hour, minute, and second are collated in the same manner.

Also, for example, with file A open,
Further, when there is a command to open the file B, the file driver 12 writes the date, month, day, hour, minute, and second at that time in the areas 18, 19 following the areas 15, 16 as described above as part of the file open processing. This is collated each time reading or writing is performed as described above.

[Modification] In the embodiment, the date, month, day, hour, minute, and second are used as different data each time. However, since the same hour, minute, second is reproduced at a considerably low rate, only this may be used without including the date. Alternatively, an arbitrarily set integer may be used as the initial value, and a value obtained by adding “1” to the initial value each time may be used as the different data. If these are binarized, reading, writing, and checking can be performed more quickly.

[Effects of the Invention] As described above, according to the present invention, removal and insertion of a RAM card during execution of a program are accurately detected, and reading and writing of erroneous data is prevented. Especially volume names,
According to the present invention, even when there are a plurality of RAM cards having the same identification code given by the operating system, such as a label name, it is possible to accurately distinguish between them and prevent reading and writing errors. Further, the point that the installation space is not required unlike the microswitch is advantageous for the hand-held electronic computer.

[Brief description of the drawings]

FIG. 1 is a block diagram showing an embodiment of the present invention. 3: Internal memory, 6: Calendar, 7: RAM card, 12:
File driver, 15, 16, 18, 19 ... File A or B
Date, month, day, hour, minute, second storage area, 17 ... Error handling routine.

 ──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-62-295141 (JP, A) JP-A-53-70869 (JP, A) JP-A-58-4442 (JP, A)

Claims (1)

(57) [Scope of request for utility model registration] 1. A variable data generating means for generating date and time information from a calendar function as different data each time, a detachable external random access memory housed in a card-like housing, and a file open of the memory. Writing means for writing date and time information from the calendar function taken from the fluctuation data generating means into the memory and the internal memory in association with the file, and thereafter reading the file from the external random access memory Prior to this, there is provided matching means for checking date and time information from the calendar function corresponding to the file written in the memory and the internal memory, and there is a difference between the date and time information from the calendar function. And reading or writing the file in the external random access memory at times.